Get completely smashed, put on your best perfume, throw a handful of rose petals on Jeremiah Payson and then kiss him. You'll regret it in the morning.
You will need to bring your own strong alcohol with you when you do this - Undercity is a 'dry' city. It takes five to six drinks of an alcoholic beverage with the words "strong alcohol" in its tooltip.
IMPORTANT: YOU MUST DO STEPS 5 THROUGH 8 IN ORDER. Also, you'll have to wait for Jeremiah to respawn if he's dead.